ICD-10-CM > M00-M99 > M05-M14 > M12 > M12.3 > M12.31 M12.31 Palindromic rheumatism, shoulder Non-Billable/Non-Specific Codes M12.311Palindromic rheumatism, right shoulderM12.312Palindromic rheumatism, left shoulderM12.319Palindromic rheumatism, unspecified shoulder